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strength of binocular functions (control) of a heterophoria to determine if it is decompensating [5] fusional convergence with a base out prism; fusional divergence with a base in prism; vertical amplitude with base up and base down prisms; positive and negative relative fusional convergence by asking patient to report when blur is appreciated
Binocular viewing of a scene creates two slightly different images of the scene in the two eyes due to the eyes' different positions on the head. These differences, referred to as binocular disparity, provide information that the brain can use to calculate depth in the visual scene, providing a major means of depth perception. [17]
Stereoacuity is defined as the minimum angle detectable, calculated as the difference between the angles subtended by both positions, A and B. Stereoacuity is possible due to binocular disparity, i.e., the difference in their binocular parallax.
Apart from testing binocular functions, Bagolini striated glasses can measure cyclotropia.The principle of the test is similar to that of double Maddox rod test. The glasses are placed in the trial frames with the striations vertical, giving rise to two horizontal line images when viewing a spotlight.
The Worth Four Light Test, also known as the Worth's four dot test or W4LT, is a clinical test mainly used for assessing a patient's degree of binocular vision and binocular single vision. Binocular vision involves an image being projected by each eye simultaneously into an area in space and being fused into a single image.
Signal strength plays an important role in the literature of binocular rivalry and visual suppression. Similarly in BSS, it is one of the factors that determine which stimulus gets suppressed perceptually. It is a multidimensional construct that is related to the stimulus' properties.
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